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Micropore mesopore composite molecular sieve and its preparation method

A technology of composite molecular sieve and mesoporous molecular sieve, which is applied in the field of microporous-mesoporous composite molecular sieve and its preparation, and can solve the problems of poor hydrothermal stability and the like

Inactive Publication Date: 2005-03-23
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Mesoporous molecular sieves do not have repeating unit cell structural units in microporous zeolites, and their internal unit structures are similar to amorphous oxides, do not contain crystalline structure regions, and only have local ordered structures. Therefore, aluminum-containing mesoporous molecular sieves and amorphous Similar to aluminosilicates, they have weak and medium strength acidity, plus poor hydrothermal stability, and mesoporous molecular sieves have a shape-selective effect on heavy oil macromolecules, but cannot crack well into small molecules. exert its shape-selective catalytic effect, thus limiting the industrial application of mesoporous molecular sieves to a large extent

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0024]2g zeolite beta (SiO 2 / Al 2 o 3 =25) Add 30ml of 0.7mol / L NaOH solution and stir for 0.5h, then add 28g of 8.7wt% CTAB aqueous solution, after stirring at room temperature for 1h, statically crystallize at 100°C for 24 hours, then use 2mol / L L hydrochloric acid adjusted the pH value of the reaction mixture to 8.5, continued crystallization at 100°C for 24 hours, and roasted at 550°C for 6h to obtain a composite molecular sieve sample. It is identified by XRD that it has the characteristic peak of mesoporous MCM-41 and the crystal phase structure of microporous zeolite beta.

Embodiment approach 2

[0026] 2g zeolite beta (SiO 2 / Al 2 o 3 =60) After adding 30ml of 1mol / L NaOH solution and stirring for 0.5h, then adding 28g of 10.2wt% CTAB aqueous solution, stirring at room temperature for 1h, static crystallization at 100°C for 24 hours, and then using 2mol / L Hydrochloric acid adjusted the pH value of the reaction mixture to 8.5, continued crystallization at 100°C for 24 hours, and calcined at 550°C for 6 hours to obtain a composite molecular sieve sample. It is identified by XRD that it has the characteristic peak of mesoporous MCM-41 and the crystal phase structure of microporous zeolite beta.

Embodiment approach 3

[0028] 2g mordenite (SiO 2 / Al 2 o 3 =14) After adding 30ml of 1mol / L NaOH solution and stirring for 1h, add 28g of 11.8wt% CTAB aqueous solution, after stirring at room temperature for 1h, statically crystallize at 100°C for 24 hours, then adjust the reaction with 6mol / L hydrochloric acid at room temperature The pH value of the mixture was 8.5, and the crystallization was continued at 100°C for 24 hours, and then calcined at 550°C for 6 hours to obtain a composite molecular sieve sample. It is identified by XRD that it has the characteristic peak of mesoporous MCM-41 and the crystal phase structure of mordenite.

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PUM

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Abstract

A composite millipore-mesopore molecular sieve is prepared through proportionally adding millipore Zeolite molecular sieve ZSM-5, beta-zeolite, mordenite, L-zeolite, MCM-22 and ZSM-35 to the solution of sodium hydroxide, stirring, adding the template agent of mesopore molecular sieve, crystallizing at 90-120 deg.C for 22-26 hr, regulating pH=7.5-7.9, and static crystallizing at 90-120 deg.c for 24-168 hr.

Description

1. Technical field [0001] The microporous-mesoporous composite molecular sieve and the preparation method thereof of the present invention belong to the field of molecular sieves and their preparation, specifically a microporous-mesoporous composite molecular sieve that can be used in the fields of catalytic cracking, catalytic cracking, hydrocracking and fine chemical industry, etc. and its preparation method. 2. Background technology [0002] As an effective solid acid catalyst, microporous zeolite molecular sieve has been widely used in the fields of petroleum refining, fine chemical industry and adsorption separation. The outstanding feature of zeolite molecular sieve is that it can adjust the acidity, and at the same time, it can provide pores and holes of different sizes to play a shape-selective effect. Therefore, molecular sieves with different pore sizes have different shape-selective effects. For example, in catalytic cracking, Y-type (twelve-membered ring) and Z...

Claims

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Application Information

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IPC IPC(8): C01B39/04
Inventor 李玉平窦涛王姗潘瑞丽谢克昌
Owner TAIYUAN UNIV OF TECH
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